Okay, I have no idea what this result means...

I have an Ubuntu live USB drive installed with smartmontools (sort of... I thought it would install to the USB drive, but it disappears when I restart). Anyway, I ran the short test and everything seemed to come back fine, then I ran the long test and now it's sitting at 90% completion, but with 0 seconds to go... I have no idea what it's doing. But in the case it's not frozen up I don't think. I can do other stuff on the computer without any problems, it just doesn't look like the test is finishing.

What other tests should I run?